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Interaction between Ni/Ti nanomultilayers and bulk Ti-6Al-4V during heat treatment

2018-11-01Artigo científico Acesso aberto
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dc.contributor.authorCavaleiro, André João
dc.contributor.authorRamos, Ana Sofia
dc.contributor.authorFernandes, Francisco Braz
dc.contributor.authorBaehtz, Carsten
dc.contributor.authorVieira, Maria Teresa Freire
dc.contributor.institutionDCM - Departamento de Ciência dos Materiais
dc.contributor.institutionCENIMAT-i3N - Centro de Investigação de Materiais (Lab. Associado I3N)
dc.contributor.pblElsevier Science B.V., Amsterdam.
dc.date.accessioned2018-11-16T23:17:20Z
dc.date.available2018-11-16T23:17:20Z
dc.date.issued2018-11-01
dc.description.abstractThe diffusion bonding of Ti-6Al-4V to NiTi alloys assisted by Ni/Ti reactive multilayer thin films indicates the diffusion of Ni from the filler material towards bulk Ti-6Al-4V. As a consequence, the fragile NiTi2 intermetallic phase is formed at the joint interface. In this context, the aim of this work is to investigate the occurrence of Ni diffusion from Ni/Ti nanomultilayers towards Ti-6Al-4V substrates. For this purpose, multilayer coated Ti alloys were studied in situ at increasing temperatures using synchrotron radiation. After heat treatment, scanning electron microscopy (SEM) analyses were carried out and elemental map distributions were acquired by electron probe microanalysis (EPMA). The EPMA maps confirm the occurrence of Ni diffusion; the presence of Ni in the substrate regions immediately underneath the nanomultilayers is clearly indicated and becomes more pronounced as the temperature increases. The presence of Ni is observed in the same locations where V is found, thus in β-Ti grains of Ti-6Al-4V. At the same time, the synchrotron results together with SEM analyses allow the increase of the amount of β-Ti phase in Ti-6Al-4V to be identified, while the thin films are mainly constituted by NiTi2. Therefore, the presence of the brittle NiTi2 intermetallic phase can be avoided if Ni diffusion is prevented.en
dc.description.versionpublishersversion
dc.description.versionpublished
dc.format.extent4741733
dc.identifier.doi10.3390/met8110878
dc.identifier.issn0379-6779
dc.identifier.otherPURE: 6355468
dc.identifier.otherPURE UUID: 8179a0c4-fc83-4f21-b302-7b8277698c39
dc.identifier.otherScopus: 85056235067
dc.identifier.otherORCID: /0000-0003-3185-0019/work/51015373
dc.identifier.urihttp://www.scopus.com/inward/record.url?scp=85056235067&partnerID=8YFLogxK
dc.identifier.urlhttps://www.scopus.com/pages/publications/85056235067
dc.language.isoeng
dc.peerreviewedyes
dc.subjectDiffusion
dc.subjectMultilayers
dc.subjectNi
dc.subjectNi/Ti
dc.subjectTi-6Al-4V
dc.subjectGeneral Materials Science
dc.titleInteraction between Ni/Ti nanomultilayers and bulk Ti-6Al-4V during heat treatmenten
dc.typejournal article
degois.publication.issue11
degois.publication.titleMetals
degois.publication.volume8
dspace.entity.typePublication
rcaap.rightsopenAccess

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